Merge pull request #4 from lastobelus/ruby_193_tests

tweaks so tests run on ruby 1.9.3
add Michael Johnston to credits
1.3.3 pre
switch license to 2013
standardize (no space between meth name and args)
adopt the standard rufus gemspec/Rakefile
remove hard dependency on open_uri_redirections

Assume users load it at will.
switch to markdown readme
document @lastobelus redirection technique
Merge branch 'master' into pluggable_matchers
switch for slow test
add empty matcher and test
extract default matchers into matcher classes